Here's the study: https://www2.mst.dk/udgiv/publications/2018/02/978-87-93614-73-4.pdf https://www2.mst.dk/udgiv/publications/2018/02/978-87-93614-... The rele

Here's the study: https://www2.mst.dk/udgiv/publications/2018/02/978-87-93614-73-4.pdf https://www2.mst.dk/udgiv/publications/2018/02/978-87-93614-... The relevant section is 6.3. The cited number is relative to a LDPE carrier bag (page 25 has pictures of what that is). When considering only climate impact, cotton bags are better after 52 times reusing them. Note that those numbers, as I understand it, assume that the reference LDPE bag is reused as a garbage bag (EOL3), which is optimal but probably not what usually happens? But EOL3 only differs by a factor of about two (page 59) from the other two EOL options, incineration and recycling; I think landfill is not an EOL they looked at because it's not done in Denmark, nor did they consider the impact if the plastic bag is not properly disposed of, ie. it ends up in the environment.